John ammon



(No Model.)

J. AMMON. Piano Porte Damper Frame.

No. 236,291. Patented Jan. 4, 1881.

UNITED STATES PATENT OFFICE.

JOHN AMMON OF NEW YORK, N. Y., ASSIGNOR T0 WESSELL, NICKEL & GROSS, OF SAME PLAGE.

PIANO-FORTE DAMPER-FRAM E.

SPECIFIGATION forming part of Letters Patent No. 236,291, dateci Janua,ry 4, 1881.

' Applcation filed May 31, 1880. (No model.)

T0 cdl whom zt may concern:

Be in known that I, JOHN AMMON, of the city of New York, in the county and State of New York, beve invented a certain new and useful Improvement in Piano-Forte Dampers, of which tbe following is a specifieation.

The objeet of my inventou is to provide in a borizontal piano fo1 adjusting; all tue dampers separately relatively to the dzunper-f'rame, so that when said frame is raised by tbe londpedal t-he dampers are all Iifted away from the stringe simulcmeously, and not one before anotber, a-s would be lable where tbere is no means of independently adjustng said (lampers.

T0 tbis end tbe inventiou consists in the eombination, in a horizontal piamo with a series of dampers, end e damperframe to Whi0h all the dzunper levers are hingedl and by Whicb they are raised, aml whiub is provided upon its upper surface With a bearingsurface fer said damper-levers, 0f m1 adjustiugscrew between eaeb damper-lever and said bearingsurfaee, whereby provision is at'orded for adjusliug the dampers relatively te tbe frame and imependentlyofeaeb other, so that wbeu lifted they Will all leave the stringe at exaetly the same time.

In the aceompanying drawings, Figure 1 represents an emi view of a damper-frame end a side view of a damper end appnrtenauees embodyng my irwentiou. Fig. 2 represents al pian of a portion 0f snob damper-frame, a damper, and string; end Fig. 3 represents a transverse sectou of the dmnper-frame and a side view of a damper-lever ha-ving my in vention applied thereto.

Similar letters of reference designate correspouding parts in all the figures.

D designates the dmnper-frmne, into wbch all the lever's B, carrying dampers O, are pivoted, as at a, in the usual manuer, and which is itself pivoted, as at I), in che manner customary in horizontal piano-fortes, and provided ab eaeh end with the usual set-serew e, for adjusting it, and so regulatng all the dampers together. A designates one of the striugs. Upon the npper surfaee of tbe frame D is, a bearing-surface, D, for ali che damper-levers B; and when the frame is lit'ted by the londpedal the said bearug-surface of the frame,

acting upon the levers B, rases all the dampers C away from the stringe.

In case any of the dmnper-levers become warped, so that individuul adjnstment is necessary, it can only be eecomplished in che ordinary construetiou 0f piano-forte actious by building up With clotb under the lever or paring away the lever at che purt wbeh reste upon the clotb. Ths, of eomse, is tedious, and can only be done by means of tools. In order to provide a convenent means for effectng snob adjustmeut I employ, in connection Witb eacb dmnper-Iever, a regulatingscrew, d, plaeed between the lever end che bearingsurfaces on the dmnper-ame, end forming m1 adjust-able stop to the downward movementof the suid lever. In the present exmnple of my invention tbese screws are inserted througb end move Wtb che levers, and are furnisbed witb felteovered tips 01 buttons e, Whieh impinge agxanst tbe dumperframe; but they might, if desmble, be inserted tbrough the dmnper-fmme, end in tbis case tbe levers Would strike upon them in their fall.

II; W be seen tbat by my invention, in addition to the mea-us onlinarly employed f0r adjustng, tbe damper-frzune with 2111 the attacbed dampers, I provide a, means whereby eaeh damper may be eonveniently adjusted indepeudently of 2111 che others, and witbout the use of any tools or applianees, a-s tbe regulating-serews may be e-asily tnrned by band.

\Vhat I clam as my invention, end desire to seeure by Lettere Patenr, is-- Tbe com bination, in a horizontal piano with a series of dampers end a damper-t'rzune, to Wheh all the damper-levers are hnged, and by whieh they are mised, and wbch is provided upou ics upper surface Witb 2L bearingsurface f01 said damper-levers, of an adjustin g-serew between eaeh damper-lever aud sad bearingsurfuee, wbereby prmisio1l s afforded fin adjusting any of the dampers relatively to the frame and indeyendently of each other, subst-antially as speeified.

J OHN AMLION.

\Vitnesses FREDK. HAYNES, THOMAS. E. BIRCH. 

